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Old 12-09-2017, 08:53 PM
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Who has 4.7L WJ experience?

Anything common on the 4.7l Grand Cherokee engine. Im going to look at a WJ that has a tapping noise. Anything they are common for that would cause this?

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Old 12-09-2017, 09:07 PM   #2
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Anything common on the 4.7l Grand Cherokee engine. Im going to look at a WJ that has a tapping noise. Anything they are common for that would cause this?
Timing chain guides are in need of replacement as are the chains.

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Old 12-09-2017, 09:13 PM
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Pretty common eh? Hopefully thats the case.She was told it needs an engine.It makes a lifter type clatter noise she says.
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Old 12-09-2017, 09:22 PM   #4
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Pretty common eh? Hopefully thats the case.She was told it needs an engine.It makes a lifter type clatter noise she says.
Depending on the miles, that could be the best route.
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Old 12-09-2017, 09:31 PM
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130k,but if I can repair it Id like to do that. I did a hemi motor not too long ago.Ill have to go listen to it and decide.
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Old 12-09-2017, 09:38 PM   #6
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130k,but if I can repair it Id like to do that. I did a hemi motor not too long ago.Ill have to go listen to it and decide.
With that low miles it probably hasn't had the best service then if the guides and chains are worn.
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Old 12-09-2017, 09:40 PM
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Ok,thanks for all the input. BTW,I like your GSD. Heres my buddy Hercules

Old Dogger likes this.
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Old 12-09-2017, 09:43 PM   #8
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Ok,thanks for all the input. BTW,I like your GSD. Heres my buddy Hercules

German Shepherds are definitely mans best friend.
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Old 12-10-2017, 08:45 AM   #9
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I use to have a Durango with the 4.7l, it had about 140k miles when I sold it. It had a light lifter clatter most of the time, but I did experience an exhaust leak that was similar, but louder. I researched exhaust leak and found an extremely common issue of the back manifold bolt breaking, not the best design I guess. It was easy to fix though, $30 bolt set and $12 gasket, took 45 min to replace, I was lucky enough the bolt had plenty sticking out of the head that easily backed out with a pair of pliers.
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Old 12-11-2017, 07:19 PM
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Thanks EXPRESSTJ,ill look at that also.
A little off topic here but IF I do buy it Ill have to tow it. The transfer case has 3 settings,4Full time, N & 4Lo. Can I either flat tow this or use a wheel dolly if the t/c is in N? Ill look if there a owners manual in it but Im suspecting not.
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Old 12-18-2017, 09:00 AM   #11
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I will look at my owners manual and see what it says about towing it. Time to lift and wheel it!!!
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Old 12-18-2017, 05:37 PM
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Nice WJ.The person who I am buying it from is going to flatbed it for me. How do you like the WJ. Some say the 4.7 isn't a great engine, hopefully I will have good luck. The interior is immaculate, the body has one dent on the hatch, very rust free Jeep. The only pic I have is an interior shot.
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Old 12-18-2017, 07:02 PM   #13
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I think there were 2 different variants of the 4.7 and the early one had a lot of problems that were corrected with a HO version. I had a friend that owned a WJ with the early 4.7 and he didn't own it long he got rid of it because of all the reliability problems on jeep forums. I have never been a fan of the grand cherokees they have always been unreliable and quirky, buy something better.
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Old 12-18-2017, 07:09 PM   #14
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Ours has been great overall, no drivetrain issues, and I have 150K on it so far. I have had some issues with the wiring in the doors, but it is an easy fix to repair the wires that break. The power from the HO is pretty sweet. The only parts that I have replaced is the water pump, AC pulley, unit bearings, and the rear upper control arm bushings. I have upgraded lots of stuff on it.
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Old 12-18-2017, 07:10 PM   #15
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When you really look at it, what jeep engine has not had any type of issue.
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Old 12-18-2017, 08:44 PM
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For the shape its in and what I'm paying for it I could turn around and make thousands.We will see.
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Old 12-18-2017, 10:43 PM   #17
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For the shape its in and what I'm paying for it I could turn around and make thousands.We will see.
Unless you are buying it for like $100 or getting it given to you i highly doubt you could make thousands old grands do not hold value well at all. My cousin has a 1999 WJ hes been trying to get rid of for a while he has the 4.0 though but it's been nothing but problems. Something to do with the front brake calipers that were wrong from the factory the blend doors in the climate control box and it continuously grows green mold on the inside for no apparent reason despite being garaged and never exposed to moisture. oh, and death wobble with stock tires and seemingly nothing loose in the suspension.

I told him to turn it into a beater trail rig but it has less than 80K on it and is in otherwise immaculate condition, This is why i would never buy a grand cherokee they are more Chrysler than jeep and the quality shows, get a 4runner.
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Old 12-18-2017, 10:57 PM   #18
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When you really look at it, what jeep engine has not had any type of issue.

I have owned 5 different jeeps with the 4.0 and the only one i had a problem with was in a 97 XJ because Chrysler thought it was a good idea to lighten the rotating assembly and went with a lighter piston that is known to crack skirts. I pulled the motor and swapped the head onto a old Renix block with 250K on it and it ran fine till i got rid of it. None of my other 4.0's ever had a problem.

I had 2 CJ7's with 258's and never had a problem out of them either (besides carburetor issues) unfortunately the jeep rusted around them.

I don't like what Chrysler did to the 4.0 in 97 because of the head/piston cracking problems manufactured by Chrysler. But i would take a post 97 4.0 to any other engine put in a wrangler after 2006. I am really not even that big of a fan of the 318 or the 360 in the ZJ's i have done to many pan gaskets on them but they do run for a long time.
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Old 12-19-2017, 10:26 AM   #19
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That's the point. My wife's 98 had a cracked head and header, my old 258 spun a bearing. You just don't know whether an engine is going to die or never die. That is way proper maintenance is the most important to help with engine life.
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Old 12-19-2017, 10:35 AM
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How I was looking for a vehicle was I really didn't care too much on the mechanical condition, to a point.I wanted something that needed engine work but with a body and interior in very good shape. And that's exactly what I got. A Florida Jeep that has mech issues. I can do those type of repairs all day, I just can't do body work.
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Old 12-19-2017, 11:01 AM   #21
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Sounds like you got a good deal and a great project. Hard to find an older GC that doesn't look like a bob cat was turned loose on the leather seats.
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Old 12-31-2017, 10:47 PM
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So I bought her. I knew it has engine issues.So after looking at it there is a loud tapping and misfire. Theres plenty of oil getting to the heads,engine isnt sludged up,chains seem tight. With the noise AND misfiring Im thinking lifters? Input?
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Old 01-03-2018, 09:44 AM   #23
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If you are not already a member, join jeepforum.com. the WJ section is pretty good, with lots of info and could be a great place to start.
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Old 01-03-2018, 09:03 PM
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Thanks,will do
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Old 01-10-2018, 12:16 AM   #25
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That 4.7l engine is notoriously bad, blows head gaskets and also throws lifter rockers easily. I bought a 4,7l WJ without knowing that and within a couple months started getting misfires, and soon blew the head gasket. I suspect the problem had already started before I bought it because it seems too coincidental, but who knows. Immediately after replacing the head gasket I had a dead cylinder and bad lifter noise. Had to replace every lash adjuster to fix it, I guess they got coolant-laced oil in them and never worked right again. Very expensive problem, should have just bought a Jasper motor amd swapped it.
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Old 01-10-2018, 12:29 AM   #26
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I had a 2001 WJ, 4.7 L.

Blend door issue (got about 35% of heat, defroster almost didn't work);
Leather seats tear up and look awful;
Power steering boxes/pump leak;
It literally leaked from everywhere, axles, tranny, transfer case, P.Steering, burned or leaked 1 liter/per oil change, etc.

Only left me stranded once. Had to flat bed me.

4.7, lots of low end torque, smooth running, fantastic in snow, burned a ton of gas.
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Old 02-02-2018, 09:44 PM
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So Ive been really busy with the WJ. I found the head dropped a couple guides(common on the 4.7) What a mess it was,but the cylinder walls were fine,no marks or damage. I ended up finding a cylinder head company who rebuilds these heads with a tighter pressed seat. So 2 new heads,8 new pistons,brgs,gaskets,and a lot of other parts.
Shes running good,just drove her to work for the first time today.











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Old 02-03-2018, 04:09 PM   #28
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I'd sell it while it still running the WJ was never good and the 4.7 is a known turd. If you want a near luxury SUV thats not junk buy a 4runner.
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Old 02-03-2018, 09:10 PM
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Haha.Well did the 4.7 have issues, yup.Hiwever the biggest issue was the valve seats that weren't pressed in all that tight. The upgraded heads have seats that are presses in a LOT tighter. A lot of the issues also come from a lack of maint.The only thing I don't like is the hydraulic cooling fan, not a big deal though. Ghee WJ is a great running and cruising vehicle,lots of power. It's a dohc engine,luckily no variable timing to deal with.I've got less than 2K in this Jeep, that includes what I paid for it. I'm very anal with maint so I won't have any issues.So yeah, ill drive it for a while.I love driving it.

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